March, 1919.] Weiss axd Dickersox : Ixsects of Rose-Mallow. 43 



Larva. — Length 12 to 13 mm. Width of thorax 1.1 mm. Long, 

 narrow, cylindrical, white or slightly yellowish except head; com- 

 posed of 13 segments. Head triangular, obtusely rounded ante- 

 riorly somewhat retracted into first segment; ventral surface dark 

 brown, dorsal surface lighter, becoming more so posteriorly. Tho- 

 racic segments subequal, sides strongly arcuate; anterior margin of 

 first thoracic segment protruding so as to cover most of head. Fine, 

 dark, impressed, median line on dorsal and ventral surfaces of first 

 thoracic segments beginning at posterior margin and extending ante- 

 riorly beyond the middle of the segment. Abdomen subcylindrical, 

 slightly flattened dorso-ventrally, sides of segments subparallel, 

 slightly arcuate, impressed at joints. First abdominal segment sub- 

 quadrate, remaining ones slightly increasing in length toward poste- 

 rior end. Ultimate segment triangular, distal end obtusely rounded 

 and slightly dark at margins. Stigmata on second thoracic and ab- 

 dominal segments one to eight. 



Pupa. — Length 6.5 mm. (Pupal cell, length 7-8 mm., width 1-1.6 

 mm.) Long, cylindrical, broadest at thorax. Head narrower than 

 thorax and slightly bent ventrally. Antennae extending posteriorly 

 to middle of first thoracic segment. Sides of thorax and anterior 

 portion of abdomen subparallel. Posterior half of abdomen grad- 

 ually tapering to tip. Posterior abdominal joints slightly ridged. 

 Wing pads extending to middle of abdomen. 



Adult. — Rhccboscelis tenuis. The following is the original de- 

 scription by Le Conte (New Species of N. Amer. Col., 1863, part 

 I, p. 82, Smithsonian Misc. Contrib.) : " Valde elongata, nigro-aenea, 

 griseo-tincta, capite convexo, haud dense punctata, profunde canali- 

 culate, thorace latitudine paulo breviore, antice sublatiore et lateribus 

 ibi rotundatis, haud dense rugose punctato versus latera oblique ex- 

 cavata, angulis posticis rectis planis, elytris rugose punctata, apice 

 singulatim rotundatis haud serrulatis ; unguiculis appendiculatis. 

 Long 20." Le Conte states that it closely resembles Agrilus c genus 

 or any other of our smaller species, but is known at once by the an- 

 tennae being scarcely longer than the head and received in well de- 

 fined but short grooves excavated in the inflexed portions of the 

 prothorax just beneath the lateral margin. 



As has been stated, the rose mallow is confined largely to the 

 Atlantic seaboard and it is evident therefore that if this is the only 



